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authorShaohua Li <shli@fb.com>2016-05-09 17:22:15 -0700
committerJens Axboe <axboe@fb.com>2016-05-10 08:41:37 -0600
commit59fa0224cfea31dde596e29555de94c961b139f9 (patch)
tree4d0812a3b897bc9f1ad1ca45bd156141b5c8b946 /block/blk-throttle.c
parent8d1547e08dda8848f01185b3fd6bb946b68de99f (diff)
downloadlinux-0-day-59fa0224cfea31dde596e29555de94c961b139f9.tar.gz
blk-throttle: don't parse cgroup path if trace isn't enabled
if trace isn't enabled, parsing cgroup path just wastes cpu Signed-off-by: Shaohua Li <shli@fb.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/blk-throttle.c')
-rw-r--r--block/blk-throttle.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 2149a1d..47a3e54 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -211,15 +211,14 @@ static struct throtl_data *sq_to_td(struct throtl_service_queue *sq)
*
* The messages are prefixed with "throtl BLKG_NAME" if @sq belongs to a
* throtl_grp; otherwise, just "throtl".
- *
- * TODO: this should be made a function and name formatting should happen
- * after testing whether blktrace is enabled.
*/
#define throtl_log(sq, fmt, args...) do { \
struct throtl_grp *__tg = sq_to_tg((sq)); \
struct throtl_data *__td = sq_to_td((sq)); \
\
(void)__td; \
+ if (likely(!blk_trace_note_message_enabled(__td->queue))) \
+ break; \
if ((__tg)) { \
char __pbuf[128]; \
\